CVE-2022-49582 net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering
A NULL pointer dereference in the Linux kernel DSA subsystem allows local attackers to cause a denial of service by triggering specific VLAN filtering code paths.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-49582?
CVE-2022-49582 is a medium-severity vulnerability in Linux kernel, published on 26 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering
The "ds" iterator variable used in dsa_port_reset_vlan_filtering() -> dsa_switch_for_each_port() overwrites the "dp" received as argument, which is later used to call dsa_port_vlan_filtering() proper.
As a result, switches which do enter that code path (the ones with vlan_filtering_is_global=true) will dereference an invalid dp in dsa_port_reset_vlan_filtering() after leaving a VLAN-aware bridge.
Use a dedicated "other_dp" iterator variable to avoid this from happening.
Weakness: CWE-476
Which versions are affected by CVE-2022-49582?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49582?
Apply the vendor's patch.
Is CVE-2022-49582 being exploited?
There is no known exploitation of CVE-2022-49582 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49582, GHSA-5hxf-f4vp-6c88, UBUNTU-CVE-2022-49582.